A source close to the 40-year-old pop beauty told the Mirror that Halliwell dumped the millionaire because she thinks that he is really, really boring.
The source said that Halliwell, who has a six-year-old daughter, Bluebell, from a relationship with film director Sacha Gervasi, was unhappy that Kaszubowski wasn’t keeping her interested.
The insider explained that Halliwell is incredibly high maintenance and the gambler found it quite difficult to be with her at times but he really fell for her.
The source added that Halliwell now wants to concentrate on being a mum and furthering her career as a singer.
Anton was married when he met Geri and is all set to divorce Russian wife of two years Zoryna Ayzenshtat.
Bollywood celebs show you colours for Navratri 2017
Photos: Kareena Kapoor Khan, Kangana Ranaut at the Mumbai airport
Birthday special: Chris Gayle and his multiple records in cricket
In Pictures: 17 dreaded on-screen villains of Bollywood
'Ramayan' director's great granddaughter Sakshi's hottest photos